Polyamide moulding composition and use thereof

Abstract

The invention relates to a polyamide molding composition which comprises an amorphous polyamide, a partially crystalline, aliphatic polyamide and also glass fibers for reinforcement. Furthermore, the polyamide molding composition according to the invention comprises a polyamide made of a cycloaliphatic diamine and a dimerized fatty acid. The polyamide molding compositions according to the invention are used in the production of electrical or electronic components, housings or housing components.

The invention claimed is: 
     
       1. A polyamide moulding composition with the following composition:
 A) from 10 to 86% by weight of at least one amorphous polyamide, 
 B) from 2 to 30% by weight of at least one partially crystalline aliphatic polyamide, 
 C) from 2 to 40% by weight of at least one polyamide formed from a monomer mixture consisting of at least one dimerised fatty acid and a cycloaliphatic amine or a mixture of cycloaliphatic amines, wherein the cycloaliphatic amine or cycloaliphatic amines are selected from the group consisting of bis-(4-amino-3-methylcyclohexyl)methane (MACM), bis-(4-aminocyclohexyl)methane (PACM), bis(4-amino-3-ethylcyclohexyl)methane (EACM), bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMDC), 2,2-(4,4′-diaminodicyclohexyl)propane (PACP) and wherein the at least one dimerised fatty acid has an acid value in the range of 145-210 mg KOH/g, 
 D) from 10 to 70% by weight of glass fibres, 
 E) from 0 to 40% by weight of particulate fillers and 
 F) from 0 to 10% by weight of further additives, 
 the quantity proportions of components D) and E) adding up to at most 70% by weight and the quantity proportions of components A) to F) adding up to 100% by weight. 
 
     
     
       2. The polyamide moulding composition according to  claim 1  with the following composition:
 A) from 12 to 61.8% by weight of the at least one amorphous polyamide, 
 B) from 5 to 25% by weight of the at least one partially crystalline aliphatic polyamide, 
 C) from 3 to 30% by weight of the at least one polyamide C) 
 D) from 30 to 69.9% by weight of glass fibres, 
 E) from 0.1 to 30% by weight of particulate fillers and also 
 F) from 0.1 to 7% by weight of further additives, 
 the quantity proportions of components D) and E) adding up to at most 70% by weight, and the quantity proportions of components A) to F) adding up to 100% by weight. 
 
     
     
       3. The polyamide moulding composition according to  claim 1 , wherein the at least one dimerised fatty acid has 30 to 50 C atoms. 
     
     
       4. The polyamide moulding composition according to B  claim 1 , wherein the cycloaliphatic diamine is selected from the group consisting of bis-(4-amino-3-methylcyclohexyl)methane (MACM), bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMDC) and mixtures thereof. 
     
     
       5. The polyamide moulding composition according to  claim 1 , wherein the cycloaliphatic diamine is selected from the group consisting of bis-(4-amino-3-methylcyclohexyl)methane (MACM), bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMDC) and mixtures thereof and the dimerised fatty acid has 36 C atoms. 
     
     
       6. The polyamide moulding composition according to  claim 1 , wherein the amorphous polyamide A) is selected from the group consisting of PA 6I, PA 6I/6T, PA 6I/6T/6NDC, PA MXDI/6I, PA MXDI/XDT/6I/6T, PA MXDI/121, PA MXDI, PA MACM10, PA MACM12, PA MACM14, PA MACM18, PA NDT/INDT, PA TMDC12, PA MACMI/12, PA MACMT/12, PA MACMI/MACM12, PA MACMT/MACM12, PA MACMI/MACMNDC, PA MACMT/MACMNDC, PA MACMI/MACM36, PA MACMT/MACM36, PA MACMI/MACMT/12, PA 6I/MACMI/12, PA 6I/6T/MACMI/MACMT, PA 6I/6T/MACMI/MACMT/12, PA MACM6/11, PA 6I/6T/MACMI/MACMT/MACM12/612, PA MACMI/MACMT/MACM12/12, PA MACMI/MACMT/MACM12, PA 6I/6T/6NDC/MACMI/MACMT/MACMNDC, PA MACM10/10 and mixtures or copolymers thereof, the MACM being able to be replaced up to at most 25% by mol, relative to the sum of the molar proportions of all the monomers of 100% by mol, by PACM, and/or the laurinlactam entirely or partially by caprolactam. 
     
     
       7. The polyamide moulding composition according to  claim 1 , wherein the at least one partially crystalline aliphatic polyamide is selected from the group consisting of PA 6, PA 46, PA 49, PA 410, PA 411, PA 412, PA 413, PA 414, PA 415, PA 416, PA 418, PA 436, PA 66, PA 69, PA 610, PA 611, PA 612, PA 613, PA 614, PA 615, PA 616, PA 617, PA 618, PA 1010, PA 66/6, PA 6/66/12, PA 6/12, PA 11, PA 12, PA 912, PA 1212, 6T/6I, MXD6, MXD6/MXDI, MXD9, MXD10, MXD11, MXD12, MXD13, MXD14, MXD15, MXD16, MXD17, MXD18, MXD36, PACM9, PACM10, PACM11, PACM12, PACM13, PACM14, PACM15, PACM16, PACM17, PACM18, PACM36, polyether amides, polyether ester amides, polyester amides and mixtures or copolymers thereof. 
     
     
       8. The polyamide moulding composition according to  claim 1 , wherein the glass fibres are selected from endless fibres and/or short glass fibres with a length of 0.2 to 20 mm. 
     
     
       9. The polyamide moulding composition according to  claim 1 , wherein the cross-section of the glass fibres is round, the glass fibres having a diameter of 3 to 20 μm. 
     
     
       10. The polyamide moulding composition according to  claim 1 , wherein the glass fibres are flat glass fibres and have an oval, elliptical, polygonal or rectangular cross-section, the flat glass fibres having at least one of the following properties:
 the length of the glass fibres is 3 to 40 μm, 
 the length of the subsidiary cross-sectional axis is 3 to 20 μm, 
 the length of the main cross-sectional axis is 6 to 40 μm, 
 the aspect ratio of the main cross-sectional axis to the subsidiary cross-sectional axis is 1.5 to 8. 
 
     
     
       11. The polyamide moulding composition according to  claim 1 , wherein the particulate fillers are selected from the group consisting of talcum, mica, silicates, quartz, wollastonite, kaolin, silicic acids, magnesium carbonate, magnesium hydroxide, chalk, ground or precipitated calcium carbonate, lime, feldspar, inorganic pigments, barium sulphate, zinc oxide, zinc sulphide, lithopones, titanium dioxide, rutile, anatase, iron oxide, iron-manganese oxide, metal oxides, spinels, copper-iron spinel, copper-chromium oxide, zinc-iron oxide, cobalt-chromium oxide, cobalt-aluminium oxide, magnesium-aluminium oxide, copper-chromium-manganese mixed oxides, copper-manganese-iron mixed oxides, rutile pigments, titanium-zinc rutile, nickel-antimony titanate, chromium-antimony titanate, hard- or soft-magnetic metals or alloys or ceramics, hollow spherical silicate fillers, aluminium oxide, boron nitride, boron carbide, aluminium nitride, calcium fluoride and mixtures thereof. 
     
     
       12. The polyamide moulding composition according to  claim 1 , wherein the further additives are selected from the group consisting of stabilisers, age-protecting agents, antioxidants, antiozonants, light-stability agents, UV stabilisers, UV absorbers, UV blockers, inorganic heat stabilisers, stabilisers based on copper halides and alkali halides, organic heat stabilisers, conductivity additives, carbon black, optical brighteners, processing aids, nucleation agents, crystallisation accelerators, crystallisation inhibitors, flow aids, lubricants, mould-release agents, plasticisers, pigments other than white pigments, colourants, marking materials and mixtures thereof. 
     
     
       13. The polyamide moulding composition according to  claim 1  wherein the polyamide moulding composition is free of olefinic impact modifiers. 
     
     
       14. A method for production of parts of an electrical or electronic component, of a housing or of a housing component household appliances, household machines, devices and apparatus for telecommunication and consumer electronics, interior and exterior parts in the automobile sector and in the field of other transport means, interior and exterior parts in the field of electrics, furniture, sport, mechanical engineering, the sanitary and hygiene field, medicine, energy- and actuation technology, comprising utilizing the polyamide moulding composition in accordance with  claim 1  in the moulding of the parts. 
     
     
       15. The polyamide moulding composition according to  claim 2 , wherein the at least one dimerised fatty acid has 30 to 50 C atoms. 
     
     
       16. The polyamide moulding composition according to  claim 2 , wherein the cycloaliphatic diamine selected from the group consisting of bis-(4-amino-3-methylcyclohexyl)methane (MACM), bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMDC) and mixtures thereof. 
     
     
       17. The polyamide moulding composition according to  claim 2 , wherein the cycloaliphatic diamine is selected from the group consisting of bis-(4-amino-3-methylcyclohexyl)methane (MACM), bis-(4-amino-3,5-dimethylcyclohexyl)methane (TMDC) and mixtures thereof and the dimerised fatty acid has 36 C atoms. 
     
     
       18. The polyamide moulding composition according to  claim 2 , wherein the amorphous polyamide A) is selected from the group consisting of PA 6I, PA 6I/6T, PA 6I/6T/6NDC, PA MXDI/6I, PA MXDI/XDT/6I/6T, PA MXDI/121, PA MXDI, PA MACM10, PA MACM12, PA MACM14, PA MACM18, PA NDT/INDT, PA TMDC12, PA MACMI/12, PA MACMT/12, PA MACMI/MACM12, PA MACMT/MACM12, PA MACMI/MACMNDC, PA MACMT/MACMNDC, PA MACMI/MACM36, PA MACMT/MACM36, PA MACMI/MACMT/12, PA 6I/MACMI/12, PA 6I/6T/MACMI/MACMT, PA 6I/6T/MACMI/MACMT/12, PA MACM6/11, PA 6I/6T/MACMI/MACMT/MACM12/612, PA MACMI/MACMT/MACM12/12, PA MACMI/MACMT/MACM12, PA 6I/6T/6NDC/MACMI/MACMT/MACMNDC, PA MACM10/10 and mixtures or copolymers thereof, the MACM being able to be replaced up to at most 25% by mol, relative to the sum of the molar proportions of all the monomers of 100% by mol, by PACM, and/or the laurinlactam entirely or partially by caprolactam. 
     
     
       19. The polyamide moulding composition according to  claim 2 , wherein the at least one partially crystalline aliphatic polyamide is selected from the group consisting of PA 6, PA 46, PA 49, PA 410, PA 411, PA 412, PA 413, PA 414, PA 415, PA 416, PA 418, PA 436, PA 66, PA 69, PA 610, PA 611, PA 612, PA 613, PA 614, PA 615, PA 616, PA 617, PA 618, PA 1010, PA 6616, PA 6/66/12, PA 6/12, PA 11, PA 12, PA 912, MXD10 MXD11 PA 1212, 6T/6I, MXD6, MXD6/MXDI, MXD9, MXD10, MXD11, MXD12, MXD13 MXD14, MXD15, MXD16, MXD17, MXD18, MXD36, PACM9, PACM10, PACM11 PACM12, PACM13, PACM14, PACM15, PACM16, PACM17, PACM18, PACM36, polyether amides, polyether ester amides, polyester amides and mixtures or copolymers thereof. 
     
     
       20. The polyamide moulding composition according to B  claim 2 , wherein the glass fibres are selected from endless fibres and/or short glass fibres with a length of 0.2 to 20 mm.